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How this is calculated#

The tool assigns each AS/NZS 3000 Appendix C load group to a phase. It then reads the demand on L1, L2 and L3, the heaviest phase and the imbalance. The max demand calculator assumes an even spread. This tool does not.

1. Phase for each load. You tag every load group with L1, L2 or L3.
2. Table. You pick Table C1 for a house or Table C2 for another occupancy. Each phase runs as a single installation.
3. Demand on each phase. The tool applies the group rule to the loads on that phase alone. It gives the demand in amperes.
4. Heaviest phase. It names the phase with the greatest demand. That figure is the primary result.
5. Sum and imbalance. It adds the three phase demands. It then gives the imbalance between the heaviest and the lightest phase.

Worked example#

A house with 30 lighting points on L1, 25 socket‑outlets on L2, 8 kW of cooking on L3 and a 3 kW water heater on L1. The phase voltage is 230 V. L1 carries 18.04 A, L2 carries 15 A and L3 carries 17.39 A. L1 is the heaviest. The three demands sum to 50.43 A. The imbalance is 16.85 %.

Limits#

• The tool applies the demand rule to each phase on its own. The sum of the phases can differ from the single‑phase total.
• Enter the phase voltage, line to neutral. The tool refuses a line voltage on three phases.
• It does not move loads for you. Change the phase tags and run it again.
• It does not size the cable or the main switch.

See also: Maximum demand and diversity, Domestic maximum demand with Table C1 and Commercial maximum demand with Table C2.